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Card 6
Front
How were oceans formed?
Back
Card 7
Front
What happened in phase two?
Back
Card 8
Front
Why was the earths old atmosphere perfect for green plants?
Back
Card 9
Front
Where did a lot of the carbon dioxide go?
Back
Card 10
Front
Due to photosynthesis by green plants, what started changing in the atmosphere?
Back
Card 11
Front
What happened to plants when they dies?
Back
Card 12
Front
What happened during this process?
Back
Card 13
Front
What happened in phase 3?
Back
Card 14
Front
Due to the build up of oxygen in the atmosphere, what happened to some organisms?
Back
Card 15
Front
When these organisms died, what happened to the other ones?
Back
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